Program C Error Message
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C Error Codes
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C Programming Error Codes
Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who C - Error Handling Advertisements Previous Page Next Page As such, C programming does not provide direct support for error handling but being a system programming language, it provides you access at lower level in the form of return values. Most of the C or even Unix function calls return -1 or NULL in case of c stderr any error and set an error code errno. It is set as a global variable and indicates an error occurred during any function call. You can find various error codes defined in
there are ways to do error handling. Of course the programmer needs to prevent errors during coding and should always test the return values of functions called by the program. A lot of C function calls return error handling in c++ a -1 or NULL in case of an error, so quick test on these return c programming error finding questions with answers values are easily done with for instance an ‘if statement’. In previous tutorials we already mention that this behavior (returning numbers to indicate c programs with errors and solutions an error) is also used in Unix or Linux like operating systems. For instance if a program successful ends the return value of the program is zero. If the program ends with an error usually a number larger https://www.tutorialspoint.com/cprogramming/c_error_handling.htm than zero is returned (for example 1). (With command ‘echo $?’ on the command line you can display the return code of a program that has previously run). So the one thing you need to remember is that you (the programmer) are responsible for error handling. You’re the person that needs to make sure that a program will gracefully terminate and not just CRASH unexpectedly! It is you that need to take appropriate action depending https://www.codingunit.com/c-tutorial-error-handling-exception-handling on the return values of function calls. Global Variable errno The global variable errno is used by C functions and this integer is set if there is an error during the function call. To make use of errno you need to include errno.h and you need to call ‘extern int errno;’ Let us take a look at an example: #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack http://stackoverflow.com/questions/1679117/printing-error-messages Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community http://askubuntu.com/questions/272741/how-to-fix-compilation-errors-that-mention-stray-342-and-stray-200 of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Printing error messages up vote 3 down vote favorite 2 I am just wondering what is the c error best way to make custom print error functions. For example I have some #defines like this in header file: #define SOCKET_ERR 0 #define BIND_ERR 1 #define LISTEN_ERR 2 etc Then maybe using this like this: if(/*something has gone wrong with socket*/) { print_error(SOCKET_ERR); } print_error(int error) { if(error == 0) { printf("Socket failure\n"); } } However, I don't think this perfect and want to do something much better. Maybe something a c programming error little bit more professional and maybe more scalable. Many thanks for any advice, c share|improve this question asked Nov 5 '09 at 8:30 ant2009 79186247396 1 Use 'fprintf(stderr, ...)' to report errors (or, at least, normally write to 'stderr' rather than 'stdout' - or write to a log file, or both log file and stderr). –Jonathan Leffler Nov 5 '09 at 8:51 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted You might consider using variadic functions for error reporting, they become so much more versatile. For instance #include
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to fix compilation errors that mention “stray ‘\342’” and “stray ‘\200’”? up vote 5 down vote favorite I wrote this program: #include